From: Zhu Lingshan <lingshan.zhu@intel•com>
To: jasowang@redhat•com, mst@redhat•com
Cc: netdev@vger•kernel.org, Zhu Lingshan <lingshan.zhu@intel•com>
Subject: [PATCH 3/7] vDPA/ifcvf: implement device MSIX vector allocation helper
Date: Mon, 10 Jan 2022 13:18:47 +0800 [thread overview]
Message-ID: <20220110051851.84807-4-lingshan.zhu@intel.com> (raw)
In-Reply-To: <20220110051851.84807-1-lingshan.zhu@intel.com>
This commit implements a MSIX vector allocation helper
Signed-off-by: Zhu Lingshan <lingshan.zhu@intel•com>
---
drivers/vdpa/ifcvf/ifcvf_main.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
index 6dc75ca70b37..64fc78eaa1a9 100644
--- a/drivers/vdpa/ifcvf/ifcvf_main.c
+++ b/drivers/vdpa/ifcvf/ifcvf_main.c
@@ -58,6 +58,30 @@ static void ifcvf_free_irq(struct ifcvf_adapter *adapter, int queues)
ifcvf_free_irq_vectors(pdev);
}
+static int ifcvf_alloc_vectors(struct ifcvf_adapter *adapter)
+{
+ struct pci_dev *pdev = adapter->pdev;
+ struct ifcvf_hw *vf = &adapter->vf;
+ u16 max_intr = 0;
+ u16 ret = 0;
+
+ /* all queues and config interrupt */
+ max_intr = vf->nr_vring + 1;
+ ret = pci_alloc_irq_vectors(pdev, 1, max_intr, PCI_IRQ_MSIX|PCI_IRQ_AFFINITY);
+
+ if (ret < 0) {
+ IFCVF_ERR(pdev, "Failed to alloc IRQ vectors\n");
+ return ret;
+ }
+
+ if (ret < max_intr)
+ IFCVF_INFO(pdev,
+ "Requested %u vectors, however only %u allocated, lower performance\n",
+ max_intr, ret);
+
+ return ret;
+}
+
static int ifcvf_request_irq(struct ifcvf_adapter *adapter)
{
struct pci_dev *pdev = adapter->pdev;
--
2.27.0
next prev parent reply other threads:[~2022-01-10 5:26 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-10 5:18 [PATCH 0/7] Supoort shared irq for virtqueues Zhu Lingshan
2022-01-10 5:18 ` [PATCH 1/7] vDPA/ifcvf: implement IO read/write helpers in the header file Zhu Lingshan
2022-01-10 5:18 ` [PATCH 2/7] vDPA/ifcvf: introduce new helpers to set config vector and vq vectors Zhu Lingshan
2022-01-10 6:15 ` Michael S. Tsirkin
2022-01-10 5:18 ` Zhu Lingshan [this message]
2022-01-10 6:12 ` [PATCH 3/7] vDPA/ifcvf: implement device MSIX vector allocation helper Michael S. Tsirkin
2022-01-10 5:18 ` [PATCH 4/7] vDPA/ifcvf: implement shared irq handlers for vqs Zhu Lingshan
2022-01-10 6:10 ` Michael S. Tsirkin
2022-01-10 5:18 ` [PATCH 5/7] vDPA/ifcvf: irq request helpers for both shared and per_vq irq Zhu Lingshan
2022-01-10 6:09 ` Michael S. Tsirkin
2022-01-10 5:18 ` [PATCH 6/7] vDPA/ifcvf: implement config interrupt request helper Zhu Lingshan
2022-01-10 6:07 ` Michael S. Tsirkin
2022-01-10 5:18 ` [PATCH 7/7] vDPA/ifcvf: improve irq requester, to handle per_vq/shared/config irq Zhu Lingshan
2022-01-10 6:04 ` Michael S. Tsirkin
[not found] ` <bc210134-4b1c-1b23-47f3-c90fb4b91b65@intel.com>
[not found] ` <d7610c1c-611f-86e2-5330-c4783db078f5@intel.com>
2022-01-13 9:52 ` Michael S. Tsirkin
2022-01-13 10:10 ` Zhu, Lingshan
2022-01-13 10:29 ` Michael S. Tsirkin
[not found] ` <7546243d-1561-51fb-55d3-fe0ff1651e48@intel.com>
2022-01-14 13:36 ` Michael S. Tsirkin
2022-01-18 3:07 ` Zhu, Lingshan
2022-01-18 8:07 ` Michael S. Tsirkin
2022-01-13 9:54 ` Michael S. Tsirkin
2022-01-10 6:05 ` [PATCH 0/7] Supoort shared irq for virtqueues Michael S. Tsirkin
2022-01-13 10:30 ` Michael S. Tsirkin
-- strict thread matches above, loose matches on Subject: below --
2022-01-10 5:19 Zhu Lingshan
2022-01-10 5:19 ` [PATCH 3/7] vDPA/ifcvf: implement device MSIX vector allocation helper Zhu Lingshan
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